Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45b6caa444f25ce3da929822fd41301e9b308be20f6505f40551fb702eccf0b0' 
  AND token = 'mr+UnVMZ/pBXa2ysDdvWy2XoXlyjvlAOQzlp1kSAloE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}